I just cut through a 6x6 pressure treated beam with my Ryobi brushless circular saw. Didn’t even bother to upgrade to a diablo blade. And it worked great!
I made six more similar cuts. No problem.
If I was doing this every day, would I upgrade to Milwaukee? Probably. (More than likely buy a corded saw.) But for weekend home improvement projects, don’t doubt the power!
I bought early into the Dewalt system based on people saying Buy Once Cry Once. But the problem is that it locks you into the ecosystem and batteries. Then even if I want a relatively light-duty cordless tool, I’m sort of forced to always go to Dewalt.
If you’re relatively new to DIY work and similar, I do recommend the first philosophy.